Abstract
Specific, tight-binding protein partners are valuable helpers to facilitate membrane protein (MP) crystallization, because they can i) stabilize the protein, ii) reduce its conformational heterogeneity, and iii) increase the polar surface from which well-ordered crystals can grow. The design and production of a new family of synthetic scaffolds (dubbed αReps, for “artificial alpha repeat protein”) have been recently described. The stabilization and immobilization of MPs in a functional state are an absolute prerequisite for the screening of binders that recognize specifically their native conformation. We present here a general procedure for the selection of αReps specific of any MP. It relies on the use of biotinylated amphipols, which act as a universal “Velcro” to stabilize, and immobilize MP targets onto streptavidin-coated solid supports, thus doing away with the need to tag the protein itself.
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Abbreviations
- 2XTY:
-
E. coli rich media
- A8-35:
-
A specific type of poly(acrylic acid)-based amphipol
- APol:
-
Amphipol
- BAPol:
-
Biotinylated A8-35
- BNAPol:
-
Biotinylated non-ionic amphipol
- BR:
-
Bacteriorhodopsin
- cmc:
-
Critical micellar concentration
- DDM:
-
Dodecyl-β-d-maltoside
- \(\overline{DP}_{n}\) :
-
Number-average degree of polymerization
- EDTA:
-
Ethylene diamine tetraacetic acid
- EM:
-
Electron microscopy
- His-tag:
-
Hexahistidine tag
- IPTG:
-
Isopropyl-β-d-1-thiogalactopyranoside
- MD:
-
Molecular dynamics
- \(\overline{M}_{n}\) :
-
Number-average molar mass
- MP:
-
Membrane protein
- MW:
-
Molecular weight
- MWCO:
-
MW cut-off
- NAPol:
-
Non-ionic amphipol
- NMR:
-
Nuclear magnetic resonance
- NTA:
-
Nitrilotriacetic acid
- OD600nm :
-
Optical density measured at 600 nm
- βOG:
-
n-octyl-β-d-glucopyranoside
- PBS:
-
Phosphate buffer saline
- PEG:
-
Polyethylene glycol
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SEC:
-
Size-exclusion chromatography
- TBS:
-
Tris-buffered saline
- TBST:
-
Tris-buffered saline supplemented with Tween 20 (w/v)
- Tris:
-
Tris(hydroxymethyl)aminomethane
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Acknowledgments
Particular thanks are due to J.D. Perlmutter and J.N. Sachs for communication of a molecular dynamics model of an A8-35 particle. This research was supported by ANR-2010-BLAN-1535, by the French Centre National de la Recherche Scientifique (CNRS), by Université Paris-5 Paris Descartes, by Université Paris-7 Denis Diderot, and by grant “DYNAMO”, ANR-11-LABX-0011-01 from the French “Initiative d’Excellence” program.
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Ferrandez, Y., Dezi, M., Bosco, M. et al. Amphipol-Mediated Screening of Molecular Orthoses Specific for Membrane Protein Targets. J Membrane Biol 247, 925–940 (2014). https://doi.org/10.1007/s00232-014-9707-3
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DOI: https://doi.org/10.1007/s00232-014-9707-3